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  • Articles  (7)
  • Data
  • 42.60
  • 72.40
  • Springer  (7)
  • Blackwell Publishing Ltd
  • ELSEVIER
  • Elsevier
  • Macmillian Magazines Ltd.
  • Molecular Diversity Preservation International
  • Nature Publishing Group (NPG)
  • 2020-2022
  • 1990-1994  (7)
  • 1985-1989
  • 1945-1949
  • 1993  (7)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (7)
  • Natural Sciences in General
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  • Articles  (7)
  • Data
Source
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  • Springer  (7)
  • Blackwell Publishing Ltd
  • ELSEVIER
  • Elsevier
  • Macmillian Magazines Ltd.
    • +
Years
  • 2020-2022
  • 1990-1994  (7)
  • 1985-1989
  • 1945-1949
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  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (7)
  • Natural Sciences in General
  • Physics  (11)
  • 1
    Electronic Resource
    Electronic Resource
    Dark build-up of holograms in BaTiO3 after recording (1993)
    Springer
    Applied physics 57 (1993), S. 437-440 
    Details
    ISSN: 1432-0630
    Keywords: 78.20 ; 61.70 ; 72.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Holograms recorded under suitable conditions in photorefractive BaTiO3 exhibit an unusual dark build-up. The diffraction efficiency increases by some orders of magnitude after the recording beams are switched off, and then steadily decreases afterwards. An interpretation of this effect in terms of a two-center charge transport model is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331783
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  • 2
    Electronic Resource
    Electronic Resource
    Far-field solution of the Helmholtz equation for double heterostructure diode lasers (1993)
    Springer
    Applied physics 57 (1993), S. 243-247 
    Details
    ISSN: 1432-0630
    Keywords: 42.60 ; 42.80 ; 42.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract On the basis of the Helmholtz equation the far-field distribution is derived for double heterostructure lasers. The results show that the far-field distribution in the direction normal to the junction plane approaches a Lorentzian function, but parallel to the junction it may be approximated by a Gaussian function. The far-field intensity patterns have “analogous elliptic” form. It is also shown, for the first time, that the separability condition is not strictly valid for the far-field of a laser diode. Only in the vicinity of the optical axis the field can be expressed as a product of two separate functions, each of which depends only on one of the two transverse coordinates parallel and perpendicular to the diode junction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332597
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  • 3
    Electronic Resource
    Electronic Resource
    Photoelectric properties of Pb1−x−y Sn x Ge y Te:In epitaxial films (1993)
    Springer
    Applied physics 57 (1993), S. 567-572 
    Details
    ISSN: 1432-0630
    Keywords: 42.80 ; 72.40 ; 68.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Pb1−x−y Sn x Ge y Te:In epitaxial films are examined in a wide temperature interval and at various background fluxes. These films have high sensitivity to infrared radiation in the spectral range λ〈20μm. The lifetime depends exponentially on temperature and varies from several seconds at T=10 K to 10−2 s at T=20 K. The two-electron model of Jahn-Teller centers is proposed to explain the results. Multielement photoresistors based on these films are fabricated and D*=1.7×1013 cm Hz1/2 W−1 at T=25 K is achieved. Noise of the photoresistors is independent of background flux when it varies from 1012 cm−2 s−1 to 1018 cm−2 s−1. As compared with Si:Ga and Ge:Hg photoresistors, the responsitivity is several orders larger at the operating temperature 25–30 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331760
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  • 4
    Electronic Resource
    Electronic Resource
    Electron traps in wide-gap n-Hg0.3Cd0.7Te characterized by time-resolved photoconductivity (1993)
    Springer
    Applied physics 57 (1993), S. 427-430 
    Details
    ISSN: 1432-0630
    Keywords: 71.55 ; 72.20.Jv ; 72.40 ; 72.80.Ey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Time-resolved photoconductivity measurements have been used to characterize electron traps in wide-gap n-HgO0.3Cd0.7Te for the first time. The characterization was made possible by combining the time-resolved photoconductive data with the analytical method conventionally used in DLTS spectroscopy. Two electron traps were found in the band gap with 61 meV and 79 meV below the conduction band edge, their concentrations are 1.1×1013 cm−3 and 5.8×1011 cm−3, respectively. Compared with DLTS spectroscopy, this characterization method markedly simplifies sample preparation and experimental procedure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331781
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  • 5
    Electronic Resource
    Electronic Resource
    Dendritic surface structures on excimer-laser irradiated PET foils (1993)
    Springer
    Applied physics 56 (1993), S. 329-333 
    Details
    ISSN: 1432-0630
    Keywords: 42.60 ; 61.80 ; 68.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A new kind of surface structure was observed on polyethylene-terephthalate (PET) foils after 248 nm KrF-excimer-laser irradiation in vacuum. The laser fluences employed were around the ablation threshold. The branched fractal structures observed have a lateral dimension in the micrometer range and a heigth of 30 to 60 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324351
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of signal-modulated optical radiation on the characteristics of a Modfet (1993)
    Springer
    Applied physics 56 (1993), S. 335-341 
    Details
    ISSN: 1432-0630
    Keywords: 72.40 ; 85.30 ; 85.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The effect of signal-modulated optical radiation on the characteristics of a GaAlAs/GaAs MODFET has been studied analytically. It is found that the offset voltage increases with modulation frequency and the effect of frequency is negligible above 5 MHz. The drain-source current decreases with increase in signal frequency at a constant radiation flux density, doping concentration and drain-source voltage. Studies on sheet concentration and transconductance also show that the signal frequency has a significant effect upto a certain modulation frequency (≲5 MHz) above which the effect of frequency is insignificant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324352
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  • 7
    Electronic Resource
    Electronic Resource
    Ablation of polyimide (Kapton™) films by pulsed (ns) ultraviolet and infrared (9.17 μm) lasers (1993)
    Springer
    Applied physics 56 (1993), S. 417-423 
    Details
    ISSN: 1432-0630
    Keywords: 42.60 ; 82.65 ; 73.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Ablation of the surface of a polyimide (Kapton™) film by single pulses of 248 nm or 308 nm radiation (∼20 ns) or 9.17 μm laser radiation (∼170 ns) was studied by photographing the emergence of the blast wave and the plume by a pulse (〈1 ns; 596 nm) of visible laser light. The dynamics of the blast wave was similar in the ultraviolet and in the infrared but the composition of the plume was obviously different. A mass of opaque solid material was ejected for as long as 2.6 μs following the IR pulse in contrast to the minute amount of solids that are seen in the ablation by UV laser pulses of ns duration. UV laser pulses of 50–400 μs duration interact with polyimide surfaces in a manner that is similar to IR laser pulses of ns duration or longer. Chemical analysis of the ablation products that are obtained under various conditions of ablation when compared to the known modes of thermal degradation of polyimide show that the reaction is a thermal process when IR laser pulses or UV laser pulses of long (〉10 μs) duration are employed. Ablation by ns UV laser pulses differs fundamentally in the chemistry of the products from all of the cases mentioned above.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332574
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